From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932802AbXGLAVf (ORCPT ); Wed, 11 Jul 2007 20:21:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964789AbXGLARe (ORCPT ); Wed, 11 Jul 2007 20:17:34 -0400 Received: from e34.co.us.ibm.com ([32.97.110.152]:33729 "EHLO e34.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S936357AbXGLAR3 (ORCPT ); Wed, 11 Jul 2007 20:17:29 -0400 Subject: [PATCH 11/23] elevate write count for link and symlink calls To: linux-kernel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk, hch@infradead.org, Dave Hansen From: Dave Hansen Date: Wed, 11 Jul 2007 17:17:24 -0700 References: <20070712001710.654CD9ED@kernel> In-Reply-To: <20070712001710.654CD9ED@kernel> Message-Id: <20070712001724.478B7596@kernel> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Dave Hansen --- lxc-dave/fs/namei.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff -puN fs/namei.c~elevate-write-count-for-link-and-symlink-calls fs/namei.c --- lxc/fs/namei.c~elevate-write-count-for-link-and-symlink-calls 2007-07-10 12:46:09.000000000 -0700 +++ lxc-dave/fs/namei.c 2007-07-10 12:46:09.000000000 -0700 @@ -2266,7 +2266,12 @@ asmlinkage long sys_symlinkat(const char if (IS_ERR(dentry)) goto out_unlock; + error = mnt_want_write(nd.mnt); + if (error) + goto out_dput; error = vfs_symlink(nd.dentry->d_inode, dentry, from, S_IALLUGO); + mnt_drop_write(nd.mnt); +out_dput: dput(dentry); out_unlock: mutex_unlock(&nd.dentry->d_inode->i_mutex); @@ -2361,7 +2366,12 @@ asmlinkage long sys_linkat(int olddfd, c error = PTR_ERR(new_dentry); if (IS_ERR(new_dentry)) goto out_unlock; + error = mnt_want_write(nd.mnt); + if (error) + goto out_dput; error = vfs_link(old_nd.dentry, nd.dentry->d_inode, new_dentry); + mnt_drop_write(nd.mnt); +out_dput: dput(new_dentry); out_unlock: mutex_unlock(&nd.dentry->d_inode->i_mutex); _